US6563860B2 - Base station having a set of phased array antennas - Google Patents

Base station having a set of phased array antennas Download PDF

Info

Publication number
US6563860B2
US6563860B2 US10087091 US8709102A US6563860B2 US 6563860 B2 US6563860 B2 US 6563860B2 US 10087091 US10087091 US 10087091 US 8709102 A US8709102 A US 8709102A US 6563860 B2 US6563860 B2 US 6563860B2
Authority
US
Grant status
Grant
Patent type
Prior art keywords
signal
magnitude
base station
despread
set
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US10087091
Other versions
US20020080858A1 (en )
Inventor
Donald L. Schilling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Technology Corp
Original Assignee
InterDigital Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date
Family has litigation

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891Space-time diversity
    • H04B7/0894Space-time diversity using different delays between antennas
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14Systems for determining direction or deviation from predetermined direction
    • G01S3/38Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristic of an antenna or an antenna system to give a desired condition of signal derived from that antenna or antenna system, e.g. to give a maximum or minimum signal
    • G01S3/42Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristic of an antenna or an antenna system to give a desired condition of signal derived from that antenna or antenna system, e.g. to give a maximum or minimum signal the desired condition being maintained automatically
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/22Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation in accordance with variation of frequency of radiated wave
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2605Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2682Time delay steered arrays
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084Equal gain combining, only phase adjustments
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference induced by transmission
    • H04B1/1081Reduction of multipath noise

Abstract

A spread spectrum base station has a set of phased array antennas for receiving a spread spectrum signal containing a plurality of channels. The base station outputs timed version of the received signal. Each timed version is associated with a respective one out of said set of phased array antennas. A plurality of despread signals is produced by despreading each timed version of the received signal using chip code sequences associated with the plurality of channels and combining the despread signals as a combined despread signal. A magnitude of the combined despread signal for obtaining a present a prior magnitude is determined. The present magnitude is compared with the prior magnitude. A delay associated with the timed versions in response to the comparison is adjusted, so antenna beams associated with the set of phased array antennas are steered towards components of the spread spectrum signal with a highest combined magnitude.

Description

This application is a continuation of U.S. patent application Ser. No. 09/766,153, filed Jan. 19, 2001, which is a continuation of U.S. application Ser. No. 09/280,328, filed Mar. 29, 1999, now U.S. Pat. No. 6,256,340, which is a continuation of U.S. application Ser. No. 08/859,522, filed May 20, 1997, now U.S. Pat. No. 5,926,502, which is a continuation of U.S. application Ser. No. 08/625,254, filed Apr. 1, 1996, now U.S. Pat. No. 5,633,889, which is a continuation of U.S. application Ser. No. 08/266,769, filed Jun. 28, 1994, now U.S. Pat. No. 5,659,572, which is a continuation-in-part of U.S. application Ser. No. 08/155,173, filed Nov. 22, 1993, now U.S. Pat. No. 5,422,908, which applications are incorporated herein by reference.

BACKGROUND

The present invention relates to spread-spectrum communications and more particularly to a method and apparatus for enhancing communications by using phased array principles for increasing signal-to-noise ratio for a spread spectrum signal with multipath arriving at a receiver.

Achieving sufficient signal strength when a received signal comes from two paths is a problem when communicating with spread-spectrum modulation in a multipath environment. The received signal from the two paths may have phase cancellation, yielding no reception, or reception with an unacceptable error rate.

Phased arrays, as is well known in the art, require N antenna elements for distinguishing up to N−1 signals arriving at the phased array from different paths or directions. This concept of spatial diversity is well developed in antenna theory.

SUMMARY

A spread spectrum base station has a set of phased array antennas for receiving a spread spectrum signal containing a plurality of channels. The base station outputs timed version of the received signal. Each timed version is associated with a respective one out of said set of phased array antennas. A plurality of despread signals is produced by despreading each timed version of the received signal using chip code sequences associated with the plurality of channels and combining the despread signals as a combined despread signal. A magnitude of the combined despread signal for obtaining a present a prior magnitude is determined. The present magnitude is compared with the prior magnitude. A delay associated with the timed versions in response to the comparison is adjusted, so antenna beams associated with the set of phased array antennas are steered towards components of the spread spectrum signal with a highest combined magnitude.

BRIEF DESCRIPTION OF THE DRAWING(S)

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a block diagram illustrating the general concept of the invention;

FIG. 2 shows two multipath signals being received by a user;

FIG. 3 is a block diagram for adjusting a phase between two receivers;

FIG. 4 is a block diagram for adjusting a phase for a plurality of spread-spectrum signals; and

FIG. 5 is a block diagram for adjusting a phase between two sets of receivers for a plurality of spread-spectrum signals.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

Reference now is made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals indicate like elements throughout the several views.

Handset

The present invention provides a unique phased array spread-spectrum system comprising receiving means, delaying means, combining means, despreading means, generating means, storing means, and comparing means. The delaying means is coupled between the receiving means and the combining means. The despreading means is coupled between the combining means and the generating means. The storing means is coupled between the generating means and the comparing means, and the comparing means is coupled to the delaying means.

The receiving means of FIG. 1 receives a spread-spectrum signal and a phased version of the spread-spectrum signal. The term “phased version” as used herein includes a version of the spread-spectrum signal having a phase different from the received spread-spectrum signal, and/or a version of the spread-spectrum signal having a time delay with respect to the received spread-spectrum signal. The different phase and/or time delay arises, as shown in FIG. 2, from the spread-spectrum signal 15 and the phased version of the spread-spectrum signal 16 arriving from different paths, such as bouncing off different buildings 17, 18. The phased array spread-spectrum system may be implemented at a base station or, as shown in FIG. 2, at a remote subscriber unit (RSU) such as a handset 19. The phase change occurs upon each reflection, since a first spread-spectrum signal 15 has one reflection and a second ray, such as the phased version of the spread-spectrum signal 16, has two reflections. As a result of the difference in time between the two signals, the multipath signals can undergo phase cancellation and cause a fade. The phased array spread-spectrum system of FIG. 1 delays or phase shifts one of the two antennas 11, 12 enough to steer the beam from the two antennas to either building, or ray path having maximum signal strength.

Typically, the receiving means, as shown in FIG. 1, includes a first antenna 11 and a second antenna 12. The spread-spectrum signal d(t)g(t)cos ω0t is received with a first receiver coupled to the first antenna 11, and the phased version of the spread-spectrum signal d(t−τ)g(t−τ)cos ω0(t−τ) is received with a second receiver coupled to the second antenna 12. The first receiver and the second receiver include radio frequency (RF) and intermediate frequency (IF) amplifiers and filters, as appropriate. The received spread-spectrum signal and the phased version of the spread-spectrum signal may be digitized.

The delaying means, shown in FIG. 1 as a delay device 13, can delay the received spread-spectrum signal with respect to the phased version of the spread-spectrum signal by a delay. The received spread-spectrum signal consequently becomes a delayed signal, with the delay approximately equal to a delay of the phased version of the spread-spectrum signal. A preferred embodiment employs digital signal processing. Accordingly, the delaying means would include a digital delay device such as a shift register. Alternatively, analog circuitry would employ an analog delay device, or a phase shifter.

Although illustrated with two antennas, the receiving means may include additional antennas for enhanced performance. The delaying means would have appropriate delaying circuits to accommodate the multiple antennas.

The combining means, shown in FIG. 1 as a combiner 14, combines the delayed signal and the phased version of the spread-spectrum signal as a combined signal. The delayed signal and the phased version of the spread-spectrum signal have approximately the same phase or time delay. Thus, an in-phase component of the delayed signal combines with an in-phase component of the phased version of the spread-spectrum signal, and a quadrature-phase component of the delayed signal combines with a quadrature-phase component of the phased version of the spread-spectrum signal.

The despreading means despreads the combined signal as a despread signal. This may be accomplished using a product detector with a chipping sequence matched to the received spread-spectrum signal, or a matched filter such as a surface acoustic wave (SAW) device having an impulse function matched to the chipping sequence of the received spread-spectrum signal. Product detectors, digital signal processors and SAW devices for despreading spread-spectrum signals are well known in the art.

The generating means generates a magnitude value from the despread signal. The magnitude value may be an absolute value, the square of the in-phase component and quadrature-phase component of the despread signal, or other metric of the despread signal for determining a relative signal strength value. A magnitude value currently being generated by the generating means is referred to herein as a present-magnitude value. A magnitude value previously generated by the generating means is referred to herein as a previous-magnitude value. The invention is taught with the previous-magnitude value being generated just before the present-magnitude value, although a previous-magnitude value may be separated in time and other magnitude values from the present magnitude value. Also, more than one previous-magnitude value may be used. The concept of the present invention is taught with one previous-magnitude value.

The storing means stores the previous-magnitude value previously generated by the generating means and the present-magnitude value presently generated by the generating means. In a digital implementation, the storing means might be embodied as a shift register or, equivalently, as gates for performing the storing function. In an analog implementation, the storing means might be embodied as two or more capacitors for storing the previous-magnitude value and the present-magnitude value.

The previous-magnitude value and the present-magnitude value are compared by the comparing means. In response to this comparison, the comparing means outputs a comparison signal. The comparing means, for example, may output a comparison signal to increase the delay τ of the delaying means, if the present-magnitude value were greater than the previous-magnitude value; conversely, the comparing means may output a comparison signal to decrease the delay τ of delaying means, if the present-magnitude value were less than the previous-magnitude value. The delaying means changes the first delay based on the comparison signal. If a plurality of previous-magnitude values were used, then a scheme may be implemented with the comparing means to weight the plurality of previous-magnitude values.

The present invention provides improvement if the delay τ is less than the time of a chip Tc. The present invention works on in-close multipath. For far-out multipath, noise is produced. Thus, the present invention finds applications in buildings or within areas where τ<Tc. For τ>Tc a RAKE system should be used.

In the exemplary arrangement shown in FIG. 3, the receiving means is embodied as the first antenna 11, a first RF/IF section 21, a first analog-to-digital converter 23, the second antenna 12, a second RF/IF section 22, and a second analog-to-digital converter 24. The first RF/IF section 21 is coupled between the first antenna 11 and the first analog-to-digital converter 23. The second RF/IF section 22 is coupled between the second antenna 12 and the second analog-to-digital converter 24. Typically, the first RF/IF section 21 generates an in-phase component and a quadrature-phase component of the received spread-spectrum signal. The second RF/IF section 22 generates an in-phase component and quadrature-phase component of the phased-version of the spread-spectrum signal.

As illustratively shown in FIG. 3, the outputs of the first analog-to-digital converter 23 and the second analog-to-digital converter 24 may go to other sections 40 for processing different channels of the spread spectrum signal 25, 26.

The delaying means is embodied as a first digital delay device 27. The delaying means additionally may include a second digital delay device 28. The first digital delay device 27 is coupled to the first analog-to-digital converter 23. If a second digital delay device 28 were employed, then the second digital delay device 28 is coupled to the second analog-to-digital converter 24.

The combining means is embodied as a first summer 29 and a second summer 30. The first summer 29 is coupled to the first digital-delay device 27 and to the second digital-delay device 28. The second summer 30 is coupled to the first digital-delay device 27 and to the second digital-delay device 28. If the second digital delay device 28 were not employed, then the first summer 29 is coupled to the first digital-delay device 27 and to the second analog-to-digital converter 24, and the second summer 30 is coupled to the first digital-delay device 27 and to the second analog-to-digital converter 24.

The despreading means is embodied as a despreader 31. The despreader 31 may be embodied as a product device coupled to an appropriate chipping-sequence generator and synchronization circuitry for despreading the received spread spectrum signal. Alternatively, the despreader 31 may be a digital signal processor which includes the appropriate product devices, or a matched filter having an impulse response matched to the chipping sequence of the received spread spectrum signal. As is well known in the art, a surface acoustic wave (SAW) device having an impulse response matched to the chipping sequence may be employed.

The generating means is embodied as a magnitude device 32. The magnitude device 32 is coupled to the despreader 31. Normally, the despreader 31 is coupled to additional circuitry for demodulating data embedded in the received spread spectrum signal.

The storing means is embodied as a shift register 33. The shift register 33 is coupled to the magnitude device 32. The storing means alternatively may be embodied as a plurality of gates, registers, or other circuitry for storing magnitude values.

The comparing means may be embodied as a comparator 34 and an up/down counter 35. The comparator 34 typically has two inputs coupled to the shift register 33. The up/down counter 35 is coupled to the output of the comparator 34 and to the first digital-delay device 27 and/or the second digital-delay device 28.

The first antenna 11 receives the spread-spectrum signal which is amplified by the first RF/IF section 21. The first RF/IF section 21 outputs an in-phase component and a quadrature-phase component to the first analog-to-digital converter 23. The first analog-to-digital converter 23 converts the in-phase component and the quadrature-phase component to a digitized in-phase component and a digitized quadrature-phase component. These components may be processed by modules 40 similar to the phase compensation circuitry 40, by coupling to the outputs of the first analog-to-digital converter 23 at the outputs 25.

Similarly, a phased version of the spread-spectrum signal is received by the second antenna 12 and then amplified and filtered by the second RF/IF section 22. The second RF/IF section 22 has outputs for an in-phase component and a quadrature-phase component which are fed to the second analog-to-digital converter 24. The outputs 26 of the second analog-to-digital converter can go to modules 40 similar to the phase compensation circuitry 40 for processing different chipping sequences. For example, a spread spectrum signal may have a plurality of spread-spectrum channels, with each spread-spectrum channel defined by a different chipping sequence. Accordingly, each module 40 would be used for a corresponding spread-spectrum channel, for processing with that particular chipping sequence.

The first digital-delay device 27 delays the digitized spread-spectrum signal by a first delay. The output of the first digital-delay device 27 is the first delayed signal. The second digital-delay device 28 delays the digitized phased version of the spread-spectrum signal by a second delay. The output of the second digital-delay device 28 is a second delayed signal. The second digital-delay device 28 is optional, and is not required for use of the present invention. If the second digital-delay device 28 were not employed, then the term “second delayed signal” refers to the digitized phased version of the spread-spectrum signal, outputted from the second analog-to-digital converter 24.

The first summer 29 combines the quadrature-phase components of the first delayed signal from the first digital-delay device 27, with the quadrature-phase components of the second delayed signal from the second digital-delay device 28. The output of the first summer 29 is a first combined signal.

The second summer 30 combines an in-phase component from the first digital-delay device 27, with an in-phase component from the second digital-delay device 28. Accordingly, the in-phase components of the first delayed signal and the second delayed signal are combined as a second combined signal.

The despreading device 31 despreads the first combined signal and the second combined signal as a despread quadrature-phase signal and a despread in-phase signal, respectively. The despread in-phase signal and the despread quadrature-phase signal can be processed by further processing devices, not shown, for demodulating data embedded in the received spread-spectrum signal.

The magnitude device 32 generates a magnitude value from the despread in-phase signal and the despread quadrature-phase signal. The magnitude value may be an absolute value determined from the despread in-phase signal and the despread quadrature-phase signal, or a square of the despread in-phase signal plus a square of the despread quadrature-phase signal. Other metrics may be used for accomplishing the same function of determining a relative signal strength value. The function of the magnitude value is to compare the signal strength of a present-magnitude value with a previous-magnitude value. The shift register 33 stores the previous-magnitude value and the present-magnitude value in order that a comparison may be made by the comparator 34. The comparator 34, when comparing the previous-magnitude value with the present-magnitude value, outputs a comparison signal. The comparison signal can control the up/down counter 35 to increase or decrease a delay of the first digital-delay device 27. Optionally, the up/down counter 35 may increase or decrease a second delay of the second digital-delay device 28.

The present invention also includes a method for maximizing signal strength of a spread-spectrum signal with multipath comprising the steps of receiving the spread-spectrum signal and a phased version of the spread-spectrum signal. The in-phase and quadrature-phase components of the received spread-spectrum signal are delayed with respect to the in-phase and quadrature-phase components of the phased version of the spread-spectrum signal by a delay, to generate a delayed signal. The in-phase component and the quadrature-phase component of the delayed signal and the in-phase component and the quadrature-phase component of the phased version of the spread-spectrum signal are combined, respectively, as the in-phase component and quadrature-phase component of a combined signal, and the combined signal is despread as an in-phase component and a quadrature-phase component of a despread signal.

The method includes generating a magnitude value from the in-phase component and the quadrature-phase component of the despread signal, and storing a previous-magnitude value and a present-magnitude value. The previous-magnitude value and the present-magnitude value are compared, and a comparison signal is output based on this comparison. Using the comparison signal, the delay is changed.

Base Station

The present invention may be extended to the base station, with the unique phased array spread-spectrum system processing a plurality of spread-spectrum signals. In this embodiment, the receiving means receive a plurality of spread-spectrum signals and a plurality of phased versions of the plurality of spread-spectrum signals. As shown in FIG. 2, the different phases and/or time delays arise from the spread-spectrum signal 15 and the phased version of the spread-spectrum signal 16 arriving from different paths, such as bouncing off different buildings 17, 18. Typically, the receiving means, as shown in FIGS. 3, 4, and 5, includes the first antenna 11 and second antenna 12. The receiving means may further include appropriate RF and IF amplifiers and filters. The received plurality of spread-spectrum signals and the received plurality of phased versions of the plurality of spread-spectrum signals may be digitized.

The delaying means, shown in FIG. 4 as delay device 121, delay device 122, . . . , delay device 123, can delay the received plurality of spread-spectrum signals, with respect to the received plurality of phased versions of the plurality of spread-spectrum signals, by a plurality of delays, respectively. The received plurality of spread-spectrum signals consequently become a plurality of delayed signals, with the delay for each of the plurality of delayed signals approximately equal to a delay of the respective phased version of the received spread-spectrum signal. A preferred embodiment would include digital signal processing. Accordingly, the delay means would include a digital delay device such as a shift register. Alternatively, analog circuitry would employ an analog delay device, or phase shifter.

The combining means, shown in FIG. 4 as a combiner 14, combines the plurality of delayed signals and the plurality of phased versions of the plurality of spread-spectrum signals as a combined signal. The output of the combining means may include appropriate RF circuitry and/or IF circuitry 124.

Each of the plurality of the delayed signals, and each of the respective phased versions of the plurality of spread-spectrum signals, respectively, have the same phase or time delay. Thus, an in-phase component of the delayed signal combines with an in-phase component of the phased version of a spread-spectrum signal, and a quadrature-phase component of the delayed signal combines with a quadrature-phase component of the phased version of the spread-spectrum signal.

The despreading means despreads the combined signal as a plurality of despread signals. This may be accomplished, as shown in FIG. 4, using a plurality of despreading devices, 131, 132, . . . , 133. Each despreading device may be implemented using a product detector or mixer with a chipping sequence matched to the received spread-spectrum signal for a particular channel. Alternatively, the despreader may be implemented using a matched filter, such as surface acoustic wave device, having an impulse function matched to the chipping sequence of the received spread-spectrum signal for the particular channel. Product detectors, mixers, digital signal processors and SAW devices for despreading spread-spectrum signal are well known in the art.

The controller means changes the plurality of delays of the delay means, in response to the plurality of despread signals. The controlling means, as illustrated in FIG. 4, is embodied as a plurality of control circuitry 141, 142, . . . , 143. The controlling means outputs a plurality of comparison signals to the plurality of delay devices 121, 122, . . . , 123.

The controlling means may include generating means, storing means, and comparing means. The generating means can generate a plurality of magnitude values from the plurality of despread signals. The storing means stores a plurality of previous-magnitude values and a plurality of present-magnitude values generated by the generating means. The comparing means compares the plurality of previous-magnitude values with the plurality of present-magnitude values, and outputs a plurality of comparison signals. An embodiment of the generating means storing means and comparing means is illustrated in FIG. 3.

In response to the plurality of comparison signals, the delay means changes the plurality of delays, respectively. FIG. 4 broadly illustrates how the control circuitry 141, 142, . . . , 143 is coupled to the delay device 121, 122, . . . , 123, respectively. As apparent to one skilled to the art, the control circuitry shown in FIG. 4 may be implemented using circuitry in FIG. 3 for each spread spectrum channel.

FIG. 5 illustrates an alternative embodiment, with a signal delay device 13 coupled to the antenna 11. Also shown is an RF/IF amplifier 21 coupled through the delay device 13 to the antenna 11, and an RF/IF amplifier 22 coupled to the antenna 12. In FIG. 5 each spread spectrum channel, defined by chipping sequences g1 (t), g2 (t), . . . , gk (t), is despread by the plurality of despreaders 151, 152, . . . , 153 for the plurality of spread-spectrum channels. Similarly, the plurality of phased versions of the plurality of spread-spectrum channels are despread by the plurality of despreaders 161, 162, . . . , 163, using chipping sequences g1 (t), g2 (t), . . . , gk (t).

The delay device 13 delays the plurality of spread-spectrum signals with respect to the received plurality of phased versions of the plurality of spread-spectrum signals by a delay, thereby generating the plurality of delayed signals.

The combiner 153 combines the plurality of delayed signals and the plurality of phased versions of the spread-spectrum signals as a combined signal. In response to the combined signal, the control circuitry 166 changes the delay of the delay device 13.

In use, the phased array spread-spectrum system and method may be used at a base station or a remote unit. A spread-spectrum signal being received by the phased array spread spectrum system and method is received by the first antenna 11 and the second antenna 12, processed by the first and second RF/IF sections 21, 22, and converted to a digital form by first analog-to-digital converter 23 and second analog-to-digital converter 24. Preferably, digital signal processing is used and may be embodied in an application-specific integrated circuit (ASIC). The digitized spread-spectrum signal from the first analog-to-digital converter 23 is preferably delayed with respect to the digitized phased version of the spread-spectrum signal from the second analog-to-digital converter 24. The first digital-delay device 27 is adjusted by an up/down counter 35 until the phase and/or time delay between the digitized spread-spectrum signal, and the digitized phased version of the spread-spectrum signal, are more closely aligned. The alignment accrues due to the variations of the up/down counter 35 in response to comparisons by the comparator 34 of a present-magnitude value and a previous-magnitude value stored in register 33.

Thus, the spread-spectrum signal and a phased version of the spread-spectrum signal are received, processed to an intermediate frequency or base band, and digitized. In-phase and quadrature-phase components are used and delayed and added. The resulting in-phase component and quadrature-phase component are then despread. The magnitude of the despread spread-spectrum signal is then taken; this represents the power or signal strength of the desired signal. The present-magnitude value and the previous-magnitude value are input to the shift register 33 and compared by the comparator 34. The comparator 34 tells the up/down counter 35 to count as an increase or decrease, i.e., up or down, thereby controlling the delay. Thus, an increase in count might increase the delay, whereas a decrease in count would decrease the delay. Various control algorithms may be used with the up/down counter 35, for more efficiency.

The phased array spread-spectrum system steers an antenna beam formed by the first antenna 11 and the second antenna 12 in the direction of the strongest multipath. This function can be performed continually, so as to be continually looking for the optimal multipath. This beam steering can be done at a base station and at a handset, i.e, a remote subscriber unit.

It will be apparent to those skilled in the art that various modifications can be made to the base station phased array spread spectrum system and method of the instant invention without departing from the scope or spirit of the invention, and it is intended that the present invention cover modifications and variations of the base station phased array spread spectrum system and method provided they come within the scope of the appended claims and their equivalents.

Claims (10)

What is claimed is:
1. A spread spectrum base station, the base station having a set of phased array antennas, the set of phased array antennas for receiving a spread spectrum signal containing a plurality of channels, the base station comprising:
a delay device for outputting timed versions of the received signal, each timed version associated with a respective one out of said set of phased array antennas;
a despreader and a combiner for producing a plurality of despread signals by despreading each timed version of the received signal using chip code sequences associated with the plurality of channels and combining the despread signals as a combined despread signal;
a magnitude device for determining a magnitude of the combined despread signal for obtaining a present and a prior magnitude;
a comparator for comparing the present magnitude with the prior magnitude; and
a counter for adjusting a delay associated with the timed versions in response to the comparison so antenna beams associated with the set of phased array antennas are steered towards components of the spread spectrum signal with a highest combined magnitude.
2. The base station of claim 1 wherein the delay device is a digital delay device for generating a delayed version of the received signal; wherein the timed versions are the received signal and the delayed version.
3. The base station of claim 1 wherein:
the despreader is for despreading in-phase and quadrature phase components of the timed versions for each channel; and
the combiner is for combining the despread in-phase and despread quadrature phase components as the combined despread signal.
4. The base station of claim 1 further comprising:
a respective set of RF/IF sections coupled to a respective antenna out of the set of antennas for converting the spread spectrum signal received by each antenna out of the set to a respective intermediate frequency signal.
5. The base station of claim 1 further comprising:
a shift register for storing the present magnitude as a subsequent prior magnitude.
6. A spread spectrum base station, the base station having a set of phased array antennas for receiving a spread spectrum signal containing a plurality of channels, the base station comprising:
means for outputting timed versions of the received signal, each timed version associated with a respective one out of said set of phased array antennas;
means for producing a plurality of despread signals by despreading each timed version of the received signal using chip code sequences associated with the plurality of channels and combining the despread signals as a combined despread signal;
means for determining a magnitude of the combined despread signal for obtaining a present and a prior magnitude;
means for comparing the present magnitude with the prior magnitude; and
means for adjusting a delay associated with the timed versions in response to the comparison so antenna beams associated with the set of phased array antennas are steered towards components of the spread spectrum signal with a highest combined magnitude.
7. The base station of claim 6 wherein the outputting timed versions means is a digital delay device for generating a delayed version of the received signal; wherein the timed versions are the received signal and the delayed version.
8. The base station of claim 6 wherein:
the producing means comprises an in-phase and quadrature phase despreader for despreading in-phase and quadrature phase components of the timed versions for each channel and a combiner for combining the despread in-phase and despread quadrature phase components as the combined despread signal.
9. The base station of claim 6 further comprising:
a respective set of RF/IF sections coupled to a respective antenna out of the set of antennas for converting the spread spectrum signal received by each antenna out of the set to a respective intermediate frequency signal.
10. The base station of claim 6 further comprising:
a shift register for storing the present magnitude as a subsequent prior magnitude.
US10087091 1993-11-22 2002-02-28 Base station having a set of phased array antennas Expired - Fee Related US6563860B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US08155173 US5422908A (en) 1993-11-22 1993-11-22 Phased array spread spectrum system and method
US08266769 US5659572A (en) 1993-11-22 1994-06-28 Phased array spread spectrum system and method
US08625254 US5633889A (en) 1993-11-22 1996-04-01 Phased array spread spectrum system and method
US08859522 US5926502A (en) 1993-11-22 1997-05-20 Phased array spread spectrum system and method
US09280328 US6256340B1 (en) 1993-11-22 1999-03-29 Phased array spread spectrum system and method5
US09766153 US6400756B2 (en) 1993-11-22 2001-01-19 Phased array spread spectrum receiver
US10087091 US6563860B2 (en) 1993-11-22 2002-02-28 Base station having a set of phased array antennas

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10087091 US6563860B2 (en) 1993-11-22 2002-02-28 Base station having a set of phased array antennas
US10427173 US7362793B2 (en) 1993-11-22 2003-05-01 Base station having a set of phased array antennas
US12106853 US7580475B2 (en) 1993-11-22 2008-04-21 Base station having a set of phased array antennas
US12546102 US8462876B2 (en) 1993-11-22 2009-08-24 Base station having a set of phased array antennas

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09766153 Continuation US6400756B2 (en) 1993-11-22 2001-01-19 Phased array spread spectrum receiver

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10427173 Continuation US7362793B2 (en) 1993-11-22 2003-05-01 Base station having a set of phased array antennas

Publications (2)

Publication Number Publication Date
US20020080858A1 true US20020080858A1 (en) 2002-06-27
US6563860B2 true US6563860B2 (en) 2003-05-13

Family

ID=23015931

Family Applications (9)

Application Number Title Priority Date Filing Date
US08266769 Expired - Lifetime US5659572A (en) 1993-11-22 1994-06-28 Phased array spread spectrum system and method
US08625254 Expired - Lifetime US5633889A (en) 1993-11-22 1996-04-01 Phased array spread spectrum system and method
US08859522 Expired - Lifetime US5926502A (en) 1993-11-22 1997-05-20 Phased array spread spectrum system and method
US09280328 Expired - Lifetime US6256340B1 (en) 1993-11-22 1999-03-29 Phased array spread spectrum system and method5
US09766153 Expired - Fee Related US6400756B2 (en) 1993-11-22 2001-01-19 Phased array spread spectrum receiver
US10087091 Expired - Fee Related US6563860B2 (en) 1993-11-22 2002-02-28 Base station having a set of phased array antennas
US10427173 Expired - Fee Related US7362793B2 (en) 1993-11-22 2003-05-01 Base station having a set of phased array antennas
US12106853 Expired - Fee Related US7580475B2 (en) 1993-11-22 2008-04-21 Base station having a set of phased array antennas
US12546102 Expired - Fee Related US8462876B2 (en) 1993-11-22 2009-08-24 Base station having a set of phased array antennas

Family Applications Before (5)

Application Number Title Priority Date Filing Date
US08266769 Expired - Lifetime US5659572A (en) 1993-11-22 1994-06-28 Phased array spread spectrum system and method
US08625254 Expired - Lifetime US5633889A (en) 1993-11-22 1996-04-01 Phased array spread spectrum system and method
US08859522 Expired - Lifetime US5926502A (en) 1993-11-22 1997-05-20 Phased array spread spectrum system and method
US09280328 Expired - Lifetime US6256340B1 (en) 1993-11-22 1999-03-29 Phased array spread spectrum system and method5
US09766153 Expired - Fee Related US6400756B2 (en) 1993-11-22 2001-01-19 Phased array spread spectrum receiver

Family Applications After (3)

Application Number Title Priority Date Filing Date
US10427173 Expired - Fee Related US7362793B2 (en) 1993-11-22 2003-05-01 Base station having a set of phased array antennas
US12106853 Expired - Fee Related US7580475B2 (en) 1993-11-22 2008-04-21 Base station having a set of phased array antennas
US12546102 Expired - Fee Related US8462876B2 (en) 1993-11-22 2009-08-24 Base station having a set of phased array antennas

Country Status (10)

Country Link
US (9) US5659572A (en)
EP (3) EP1085342A1 (en)
JP (1) JP3796721B2 (en)
CN (7) CN1306717C (en)
CA (1) CA2193843C (en)
DE (3) DE19581691T1 (en)
DK (2) DK0767976T3 (en)
ES (1) ES2144383T3 (en)
FI (1) FI965223A (en)
WO (1) WO1996000991A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040229588A1 (en) * 2003-05-13 2004-11-18 Lg Electronics Inc. Receiving diversity apparatus and method of mobile station for high data rate type mobile communication system
US20040266483A1 (en) * 2001-10-05 2004-12-30 Seung-Won Choi Calibration apparatus for smart antenna and method thereof
US20050200393A1 (en) * 2002-10-25 2005-09-15 Koninklijke Philips Electronics N.V. Method and device for generating a clock signal with predetermined clock signal properties
US20080192808A1 (en) * 1993-11-22 2008-08-14 Interdigital Technology Corporation Base station having a set of phased array antennas
US20090210933A1 (en) * 2008-02-15 2009-08-20 Shear Jeffrey A System and Method for Online Content Production
US20100117904A1 (en) * 2008-11-13 2010-05-13 Tetsuhiko Miyatani Multi-antenna signal receiving device processing multi-path interference
US20100317306A1 (en) * 2009-06-15 2010-12-16 Ming Lee Diversity antenna system and method utilizing a threshold value
US8537943B1 (en) * 2010-08-27 2013-09-17 Greenwich Technology Associates Sum and forward Elam receiver
US9960482B2 (en) 2013-03-15 2018-05-01 Agc Automotive Americas R&D, Inc. Window assembly with transparent regions having a performance enhancing slit formed therein

Families Citing this family (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6118807A (en) * 1994-12-23 2000-09-12 Intermec Ip Corp. Methodology for received signal enhancement utilizing delay diversity processing
US5574747A (en) 1995-01-04 1996-11-12 Interdigital Technology Corporation Spread spectrum adaptive power control system and method
US6900775B2 (en) * 1997-03-03 2005-05-31 Celletra Ltd. Active antenna array configuration and control for cellular communication systems
WO1998039856A1 (en) 1997-03-03 1998-09-11 Celletra Ltd. Method and system for improving communication
JPH10247869A (en) 1997-03-04 1998-09-14 Nec Corp Diversity circuit
US5930293A (en) * 1997-03-10 1999-07-27 Lucent Technologies Inc. Method and apparatus for achieving antenna receive diversity with wireless repeaters
US6160510A (en) * 1997-07-03 2000-12-12 Lucent Technologies, Inc. Delay line antenna array system and method thereof
US6259687B1 (en) 1997-10-31 2001-07-10 Interdigital Technology Corporation Communication station with multiple antennas
US6700939B1 (en) * 1997-12-12 2004-03-02 Xtremespectrum, Inc. Ultra wide bandwidth spread-spectrum communications system
US7346120B2 (en) * 1998-12-11 2008-03-18 Freescale Semiconductor Inc. Method and system for performing distance measuring and direction finding using ultrawide bandwidth transmissions
US6167039A (en) * 1997-12-17 2000-12-26 Telefonaktiebolget Lm Ericsson Mobile station having plural antenna elements and interference suppression
JP2918873B1 (en) * 1998-02-17 1999-07-12 ケイディディ株式会社 Spread spectrum communication array antenna system
EP0948082A1 (en) * 1998-04-03 1999-10-06 Lucent Technologies Inc. Adaptive antenna
US6289057B1 (en) * 1998-04-30 2001-09-11 Nortel Networks Limited Method and apparatus for energy detection in a modem
JPH11340949A (en) * 1998-05-21 1999-12-10 Matsushita Electric Ind Co Ltd Cdma communication equipment and cdma communication method
EP1804494A3 (en) * 1998-09-17 2008-04-30 Matsushita Electric Industrial Co., Ltd. Digital TV broadcast receiving apparatus, and transmitting and receiving system
US6201828B1 (en) * 1998-11-12 2001-03-13 Nortel Networks Limited Fine estimation of multipath delays in spread-spectrum signals
US6128330A (en) 1998-11-24 2000-10-03 Linex Technology, Inc. Efficient shadow reduction antenna system for spread spectrum
US6449469B1 (en) * 1999-03-01 2002-09-10 Visteon Global Technologies, Inc. Switched directional antenna for automotive radio receivers
US6597669B1 (en) * 1999-03-16 2003-07-22 Northrop Grumman Corporation Queue segmentation and addressing method and apparatus for a cell switch in a processing communications satellite
US6351246B1 (en) 1999-05-03 2002-02-26 Xtremespectrum, Inc. Planar ultra wide band antenna with integrated electronics
US6701141B2 (en) * 1999-05-18 2004-03-02 Lockheed Martin Corporation Mixed signal true time delay digital beamformer
US7376191B2 (en) * 2000-10-27 2008-05-20 Lightwaves Systems, Inc. High bandwidth data transport system
US6597730B1 (en) * 1999-11-03 2003-07-22 Northrop Grumman Corporation Satellite communication array transceiver
US6970524B1 (en) * 1999-12-06 2005-11-29 At&T Corp. Methods and systems for symbol timing recovery
GB9929873D0 (en) * 1999-12-18 2000-02-09 Roke Manor Research Improvements in or relating to the reception of spread spectrum signals
FI19992734A (en) * 1999-12-20 2001-06-21 Nokia Networks Oy A method for spread spectrum receiver for receiving and
EP1146663A3 (en) * 2000-04-14 2005-11-30 ALCATEL ALSTHOM COMPAGNIE GENERALE D'ELECTRICITE (abrégé: ALCATEL ALSTHOM) Method and apparatus for automatic delay compensation in space diversity radio transmissions
WO2002013313A3 (en) 2000-08-07 2003-01-03 Xtremespectrum Inc Electrically small planar uwb antenna apparatus and system thereof
US7031371B1 (en) * 2000-09-25 2006-04-18 Lakkis Ismail A CDMA/TDMA communication method and apparatus for wireless communication using cyclic spreading codes
US7339955B2 (en) * 2000-09-25 2008-03-04 Pulse-Link, Inc. TDMA communication method and apparatus using cyclic spreading codes
JP2002135187A (en) * 2000-10-24 2002-05-10 Sony Corp Receiver
US7580488B2 (en) * 2000-11-29 2009-08-25 The Penn State Research Foundation Broadband modulation/demodulation apparatus and a method thereof
GB0102384D0 (en) * 2001-01-31 2001-03-14 Secr Defence Signal detection using a phased array antenna
US6751264B2 (en) 2001-07-27 2004-06-15 Motorola, Inc. Receiver and method therefor
US6760386B2 (en) 2001-07-27 2004-07-06 Motorola, Inc. Receiver and method therefor
CN100413224C (en) * 2001-09-12 2008-08-20 英芬能技术公司 CDMA wireless systems
EP1451901A4 (en) * 2001-11-09 2006-07-12 Pulse Link Inc Ultra-wideband antenna array
US7099380B1 (en) 2001-11-16 2006-08-29 Marvell International Ltd. Apparatus for antenna diversity for wireless communication and method thereof
US7103118B2 (en) * 2001-11-26 2006-09-05 Dataradio Inc. Vectorial combiner for diversity reception in RF tranceivers
US7450637B2 (en) * 2001-12-06 2008-11-11 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7391815B2 (en) * 2001-12-06 2008-06-24 Pulse-Link, Inc. Systems and methods to recover bandwidth in a communication system
US7483483B2 (en) * 2001-12-06 2009-01-27 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7403576B2 (en) 2001-12-06 2008-07-22 Pulse-Link, Inc. Systems and methods for receiving data in a wireless communication network
US20050053121A1 (en) * 2001-12-06 2005-03-10 Ismail Lakkis Ultra-wideband communication apparatus and methods
US7349439B2 (en) * 2001-12-06 2008-03-25 Pulse-Link, Inc. Ultra-wideband communication systems and methods
US20050152483A1 (en) * 2001-12-06 2005-07-14 Ismail Lakkis Systems and methods for implementing path diversity in a wireless communication network
US7406647B2 (en) * 2001-12-06 2008-07-29 Pulse-Link, Inc. Systems and methods for forward error correction in a wireless communication network
US7317756B2 (en) * 2001-12-06 2008-01-08 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7289494B2 (en) * 2001-12-06 2007-10-30 Pulse-Link, Inc. Systems and methods for wireless communication over a wide bandwidth channel using a plurality of sub-channels
US8045935B2 (en) 2001-12-06 2011-10-25 Pulse-Link, Inc. High data rate transmitter and receiver
US20050058180A1 (en) * 2001-12-06 2005-03-17 Ismail Lakkis Ultra-wideband communication apparatus and methods
US7257156B2 (en) * 2001-12-06 2007-08-14 Pulse˜Link, Inc. Systems and methods for equalization of received signals in a wireless communication network
US20050201473A1 (en) * 2001-12-06 2005-09-15 Ismail Lakkis Systems and methods for receiving data in a wireless communication network
US7043273B2 (en) 2002-01-15 2006-05-09 Telefonaktiebolaget Lm Ericsson (Publ) Diversity branch delay alignment in radio base station
CA2416627A1 (en) * 2002-01-18 2003-07-18 Raytheon Company Combining signals exhibiting multiple types of diversity
US6795452B2 (en) 2002-05-31 2004-09-21 Sandbridge Technologies, Inc. Method of tracking time intervals for a communication signal
US6828935B1 (en) * 2002-07-19 2004-12-07 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Digitally synthesized phased antenna for multibeam global positioning
US7447284B2 (en) 2003-03-28 2008-11-04 Freescale Semiconductor, Inc. Method and apparatus for signal noise control
KR100981495B1 (en) * 2005-10-12 2010-09-10 삼성전자주식회사 Method and apparatus for transmitting data in a communication system
WO2008149351A3 (en) * 2008-06-04 2010-02-25 Bon Networks Inc. Electronically steerable antenna system for low power consumption
US8340233B2 (en) 2009-01-28 2012-12-25 Aristotle University Thessaloniki—Research Committee Method and apparatus for combining signals at wireless receivers in the absence of channel gain estimation
US9020074B2 (en) * 2010-02-18 2015-04-28 Intel Mobile Communications GmbH Apparatus and method for antenna diversity reception
US9143136B2 (en) 2011-12-14 2015-09-22 Waveworks, Inc. Pumped distributed wave oscillator system
US9276618B1 (en) * 2013-05-03 2016-03-01 Marvell International Ltd. Systems and methods for sidelobe cancellation
US10009051B1 (en) * 2017-11-04 2018-06-26 Facebook, Inc. Modem-agnostic analog spatial multiplexing

Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189733A (en) 1978-12-08 1980-02-19 Northrop Corporation Adaptive electronically steerable phased array
US4291410A (en) 1979-10-24 1981-09-22 Rockwell International Corporation Multipath diversity spread spectrum receiver
US4361891A (en) 1980-12-22 1982-11-30 General Electric Company Spread spectrum signal estimator
US4549303A (en) 1983-12-27 1985-10-22 The United States Of America As Represented By The Secretary Of The Army Multichannel time division multiplexed trunk transmission link
US4587662A (en) 1983-01-28 1986-05-06 International Standard Electric Corporation TDMA spread-spectrum receiver with coherent detection
US4587661A (en) 1983-03-04 1986-05-06 Rca Corporation Apparatus for synchronizing spread spectrum transmissions from small earth stations used for satellite transmission
US4608701A (en) 1983-09-22 1986-08-26 Hollandse Signaalapparaten B.V. Communication receiving unit for the suppression of noise and interference signals
US4800390A (en) 1979-05-23 1989-01-24 Stc Plc Adaptive antenna arrays for frequency hopped systems
US5081643A (en) 1990-11-16 1992-01-14 Scs Mobilecom, Inc. Spread spectrum multipath receiver apparatus and method
US5101501A (en) 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system
US5107273A (en) 1981-05-11 1992-04-21 The United States Of America As Represented By The Secretary Of The Army Adaptive steerable null antenna processor with null indicator
US5109390A (en) 1989-11-07 1992-04-28 Qualcomm Incorporated Diversity receiver in a cdma cellular telephone system
US5119103A (en) 1990-11-16 1992-06-02 The United States Of America As Represented By The Secretary Of The Navy Method of steering the gain of a multiple antenna global positioning system receiver
WO1992010890A1 (en) 1990-12-07 1992-06-25 Qualcomm Incorporated Cdma microcellular telephone system and distributed antenna system therefor
GB2259430A (en) 1991-09-07 1993-03-10 Motorola Ltd Radio receiver and transmitter providing diversity
EP0531028A2 (en) 1991-09-06 1993-03-10 General Instrument Corporation Of Delaware Multi-transmitter wide-area cellular broadcast communication system
US5248982A (en) 1991-08-29 1993-09-28 Hughes Aircraft Company Method and apparatus for calibrating phased array receiving antennas
US5260968A (en) 1992-06-23 1993-11-09 The Regents Of The University Of California Method and apparatus for multiplexing communications signals through blind adaptive spatial filtering
US5422908A (en) 1993-11-22 1995-06-06 Interdigital Technology Corp. Phased array spread spectrum system and method
US5425059A (en) 1992-07-31 1995-06-13 Nec Corporation Adaptive receiving apparatus for digital communication system
US6006113A (en) 1994-12-01 1999-12-21 Radio Frequency Systems, Inc. Radio signal scanning and targeting system for use in land mobile radio base sites
US6252867B1 (en) 1999-09-30 2001-06-26 Motorola, Inc. Method and apparatus for determining remote unit location using phased array antenna elements
US6256340B1 (en) 1993-11-22 2001-07-03 Interdigital Technology Corporation Phased array spread spectrum system and method5

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5255310A (en) * 1975-10-30 1977-05-06 Kokusai Denshin Denwa Co Ltd Phase control circuit
JPH0225503B2 (en) * 1981-07-15 1990-06-04 Fuji Photo Film Co Ltd
JPS6444662A (en) 1987-08-13 1989-02-17 Koyo Seiko Co Telephone card
JPS6444662U (en) 1987-09-09 1989-03-16
US5062148A (en) * 1989-06-02 1991-10-29 Hewlett-Packard Company Multi-path fading simulator
US5138650A (en) 1990-09-27 1992-08-11 Motorola, Inc. Cordless telephone with internal debit and credit memory
JPH04185130A (en) 1990-11-20 1992-07-02 Clarion Co Ltd Diversity receiver for spread spectrum communication
US5402450A (en) * 1992-01-22 1995-03-28 Trimble Navigation Signal timing synchronizer
US5224122A (en) * 1992-06-29 1993-06-29 Motorola, Inc. Method and apparatus for canceling spread-spectrum noise
JP3396270B2 (en) * 1993-08-10 2003-04-14 富士通株式会社 Optical dispersion compensation system

Patent Citations (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189733A (en) 1978-12-08 1980-02-19 Northrop Corporation Adaptive electronically steerable phased array
US4800390A (en) 1979-05-23 1989-01-24 Stc Plc Adaptive antenna arrays for frequency hopped systems
US4291410A (en) 1979-10-24 1981-09-22 Rockwell International Corporation Multipath diversity spread spectrum receiver
US4361891A (en) 1980-12-22 1982-11-30 General Electric Company Spread spectrum signal estimator
US5107273A (en) 1981-05-11 1992-04-21 The United States Of America As Represented By The Secretary Of The Army Adaptive steerable null antenna processor with null indicator
US4587662A (en) 1983-01-28 1986-05-06 International Standard Electric Corporation TDMA spread-spectrum receiver with coherent detection
US4587661A (en) 1983-03-04 1986-05-06 Rca Corporation Apparatus for synchronizing spread spectrum transmissions from small earth stations used for satellite transmission
US4608701A (en) 1983-09-22 1986-08-26 Hollandse Signaalapparaten B.V. Communication receiving unit for the suppression of noise and interference signals
US4549303A (en) 1983-12-27 1985-10-22 The United States Of America As Represented By The Secretary Of The Army Multichannel time division multiplexed trunk transmission link
US5101501A (en) 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system
US5109390A (en) 1989-11-07 1992-04-28 Qualcomm Incorporated Diversity receiver in a cdma cellular telephone system
US5081643A (en) 1990-11-16 1992-01-14 Scs Mobilecom, Inc. Spread spectrum multipath receiver apparatus and method
US5119103A (en) 1990-11-16 1992-06-02 The United States Of America As Represented By The Secretary Of The Navy Method of steering the gain of a multiple antenna global positioning system receiver
WO1992010890A1 (en) 1990-12-07 1992-06-25 Qualcomm Incorporated Cdma microcellular telephone system and distributed antenna system therefor
US5248982A (en) 1991-08-29 1993-09-28 Hughes Aircraft Company Method and apparatus for calibrating phased array receiving antennas
EP0531028A2 (en) 1991-09-06 1993-03-10 General Instrument Corporation Of Delaware Multi-transmitter wide-area cellular broadcast communication system
GB2259430A (en) 1991-09-07 1993-03-10 Motorola Ltd Radio receiver and transmitter providing diversity
US5260968A (en) 1992-06-23 1993-11-09 The Regents Of The University Of California Method and apparatus for multiplexing communications signals through blind adaptive spatial filtering
US5425059A (en) 1992-07-31 1995-06-13 Nec Corporation Adaptive receiving apparatus for digital communication system
US5422908A (en) 1993-11-22 1995-06-06 Interdigital Technology Corp. Phased array spread spectrum system and method
US6256340B1 (en) 1993-11-22 2001-07-03 Interdigital Technology Corporation Phased array spread spectrum system and method5
US6400756B2 (en) * 1993-11-22 2002-06-04 Interdigital Technology Corporation Phased array spread spectrum receiver
US6006113A (en) 1994-12-01 1999-12-21 Radio Frequency Systems, Inc. Radio signal scanning and targeting system for use in land mobile radio base sites
US6252867B1 (en) 1999-09-30 2001-06-26 Motorola, Inc. Method and apparatus for determining remote unit location using phased array antenna elements

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Data Communication, Networks and Systems, Howard W. Sams & Co., 1987, pp. 343-352.
Digital Communications With Space Applications, S.W. Golomb et al., Prentice-Hall, Inc., 1964, pp. 45-64.
S. Sivanand, "On Adaptive Arrays in Mobiile Communication," Commercial Applications and Dual Use Technology, Jun. 16-17, 1993, pp. 55-58.

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7580475B2 (en) * 1993-11-22 2009-08-25 Interdigital Technology Corporation Base station having a set of phased array antennas
US20080192808A1 (en) * 1993-11-22 2008-08-14 Interdigital Technology Corporation Base station having a set of phased array antennas
US20040266483A1 (en) * 2001-10-05 2004-12-30 Seung-Won Choi Calibration apparatus for smart antenna and method thereof
US20050200393A1 (en) * 2002-10-25 2005-09-15 Koninklijke Philips Electronics N.V. Method and device for generating a clock signal with predetermined clock signal properties
US7126407B2 (en) * 2002-10-25 2006-10-24 Koninklijke Philips Electronics N.V. Method and device for generating a clock signal with predetermined clock signal properties
US7369832B2 (en) * 2003-05-13 2008-05-06 Lg Electronics Inc. Receiving diversity apparatus and method of mobile station for high data rate type mobile communication system
US20040229588A1 (en) * 2003-05-13 2004-11-18 Lg Electronics Inc. Receiving diversity apparatus and method of mobile station for high data rate type mobile communication system
US20090210933A1 (en) * 2008-02-15 2009-08-20 Shear Jeffrey A System and Method for Online Content Production
US8779979B2 (en) * 2008-11-13 2014-07-15 Samsung Electronics Co., Ltd. Multi-antenna signal receiving device processing multi-path interference
US20100117904A1 (en) * 2008-11-13 2010-05-13 Tetsuhiko Miyatani Multi-antenna signal receiving device processing multi-path interference
US20100317306A1 (en) * 2009-06-15 2010-12-16 Ming Lee Diversity antenna system and method utilizing a threshold value
US8385868B2 (en) 2009-06-15 2013-02-26 Agc Automotive Americas R&D, Inc. Diversity antenna system and method utilizing a threshold value
US8515378B2 (en) 2009-06-15 2013-08-20 Agc Automotive Americas R&D, Inc. Antenna system and method for mitigating multi-path effect
US9094115B2 (en) 2009-06-15 2015-07-28 Agc Automotive Americas R&D, Inc. Antenna system and method for mitigating multi-path effect
US20100317309A1 (en) * 2009-06-15 2010-12-16 Ming Lee Antenna System And Method For Mitigating Multi-Path Effect
US8948702B2 (en) 2009-06-15 2015-02-03 Agc Automotive Americas R&D, Inc. Antenna system and method for optimizing an RF signal
US8537943B1 (en) * 2010-08-27 2013-09-17 Greenwich Technology Associates Sum and forward Elam receiver
US9960482B2 (en) 2013-03-15 2018-05-01 Agc Automotive Americas R&D, Inc. Window assembly with transparent regions having a performance enhancing slit formed therein

Also Published As

Publication number Publication date Type
US5926502A (en) 1999-07-20 grant
EP1085342A1 (en) 2001-03-21 application
US20050047483A1 (en) 2005-03-03 application
CN1306717C (en) 2007-03-21 grant
CN1392674A (en) 2003-01-22 application
DE19581691T0 (en) grant
CN1158187A (en) 1997-08-27 application
CN1596011A (en) 2005-03-16 application
EP1093185A2 (en) 2001-04-18 application
EP0767976A4 (en) 2000-05-17 application
CN1086871C (en) 2002-06-26 grant
CN1394000A (en) 2003-01-29 application
CN1177412C (en) 2004-11-24 grant
US20010024466A1 (en) 2001-09-27 application
DK174844B1 (en) 2003-12-15 grant
CN1315346C (en) 2007-05-09 grant
FI965223A0 (en) 1996-12-27 application
ES2144383T1 (en) 2000-06-16 application
JP3796721B2 (en) 2006-07-12 grant
US5633889A (en) 1997-05-27 grant
US20020080858A1 (en) 2002-06-27 application
CN1392676A (en) 2003-01-22 application
US5659572A (en) 1997-08-19 grant
US6256340B1 (en) 2001-07-03 grant
DE69527964D1 (en) 2002-10-02 grant
DK0767976T3 (en) 2003-01-06 grant
US7362793B2 (en) 2008-04-22 grant
FI965223D0 (en) grant
EP1093185A3 (en) 2001-11-21 application
CN1393999A (en) 2003-01-29 application
CN1173483C (en) 2004-10-27 grant
ES2144383T3 (en) 2003-03-01 grant
US8462876B2 (en) 2013-06-11 grant
CA2193843A1 (en) 1996-01-11 application
CN1392675A (en) 2003-01-22 application
DE69527964T2 (en) 2003-03-27 grant
US7580475B2 (en) 2009-08-25 grant
DE19581691T1 (en) 1997-06-19 grant
CA2193843C (en) 2000-11-14 grant
WO1996000991A1 (en) 1996-01-11 application
CN1173482C (en) 2004-10-27 grant
JPH10502505A (en) 1998-03-03 application
EP0767976A1 (en) 1997-04-16 application
CN1173484C (en) 2004-10-27 grant
US20080192808A1 (en) 2008-08-14 application
DK767976T3 (en) grant
US6400756B2 (en) 2002-06-04 grant
DK145296A (en) 1997-02-26 application
US20090310652A1 (en) 2009-12-17 application
FI965223A (en) 1997-02-26 application
EP0767976B1 (en) 2002-08-28 grant

Similar Documents

Publication Publication Date Title
US5887021A (en) Base station receiver and a method for receiving a signal
US6917597B1 (en) System and method of communication using transmit antenna diversity based upon uplink measurement for the TDD mode of WCDMA
US5646964A (en) DS/CDMA receiver for high-speed fading environment
US6108323A (en) Method and system for operating a CDMA cellular system having beamforming antennas
US5260711A (en) Difference-in-time-of-arrival direction finders and signal sorters
US7092690B2 (en) Genetic algorithm-based adaptive antenna array processing method and system
US6069912A (en) Diversity receiver and its control method
US5383220A (en) Data demodulator of a receiving apparatus for spread spectrum communication
US4281411A (en) High speed digital communication receiver
US7187949B2 (en) Multiple basestation communication system having adaptive antennas
US5740208A (en) Interference cancellation apparatus for mitigating the effects of poor affiliation between a base station and a mobile unit
US6222498B1 (en) CDMA multiuser receiver featuring a combination of array antenna and multiuser cancelers
US6904076B1 (en) Interference canceller device and radio communication device
US6546043B1 (en) Method and apparatus for cancellation of multiple access interference in a code division multiple access (CDMA) communication system
US4268829A (en) Steerable null antenna processor with gain control
US6005516A (en) Diversity among narrow antenna beams
US5627855A (en) Programmable two-part matched filter for spread spectrum
US5757318A (en) Narrow beam wireless systems with angularly diverse antennas
US6327299B1 (en) Method and system for measuring and adjusting the quality of an orthogonal transmit diversity signal in a wireless communications system
US6480526B1 (en) Spread spectrum receive apparatus
US6128486A (en) Reception method and base station receiver
US6047019A (en) Receiver for spectrum spread communication system
US5929811A (en) Adaptive array with automatic loop gain control
US4152702A (en) Adaptive antenna lobing on spread spectrum signals at negative S/N
US5940453A (en) Artificial fading for frequency offset mitigation

Legal Events

Date Code Title Description
FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Expired due to failure to pay maintenance fee

Effective date: 20150513